Phonograph attachment



(No Modl.) Y T L. GLASS. PHONOGRAPH ATTACHMENT.

No. 539,806. Patented May 28, 1895.

INVENTDFL- 44W,

WIT-'NESEES- UNITED STATES PATENT Fries.

Louis GLASS, or SAN FRANCISCO, CALIFORNIA.

PHONOGRAPH ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 539,806, dated May 28, 1895 Application filed May 31,1894. Serial No. 513,027. (N0 model.)

To all whom it may concern.-

Be it known that I, LOUIS GLASS, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented certain new and useful Improvements in Phonograph Attachments; and I do hereby declare the following to be a full, clear, and exact description of said invention, such as will enable others skilled in the art to which it most nearly appertains to make, use, and practice the same.

My invention relates to certain new and useful improvements in phonograph attachments as will be hereinafter more fully set forth in the drawings, described and pointed out in thespecification; and the object of my invention is to eliminate or overcome the vibratory movements (other than those actually imparted by the tones) of the diaphragm and its attachments, so as to perfect to the highest degree the registering on the phonogram cylinder of the sound undulations, and with same application to reproducing mechanism to the proper, full and correct intonation of the registered sounds.

Ordinarily, the substance used in a phonograph upon which sound vibrations are engraved opposes a resistance to the engraving tool or needle during the indenting wave, and inasmuch as little or no resistance is offered during the withdrawing wave, there is likely to be caused an irregular movement or vibration of the recording and reproducing mechanism.

I have discovered, that by the .use of my improved attachments I overcome the undue vibration of the recording and reproducing mechanism and thus allow such a recording of the sound undulations as will substantially perfect the reproduction of the sound intonation, whether the recording be in heavy or light tones.

My invention consists in the combination and arrangement of the parts as more fully described hereinafter and as set forth in the claims, reference being had to the accompanying drawings, in which- Figure 1 is a cross-sectional view, in side elevation, of the phonograph-cylinder. Fig. 2 is a bottom view; and Fig. 3, a front sectional view, in elevation, on line a: :r, Fig. 2.

Arepresents the arm of the traveling reprobolt H, the lower end of said bolt engaging one end of a tension spring F arranged on the extended lower portion of the bolt, as

shown. To the lower end of the screw-bolt is secured the outer end of a spring F, the opposite end of said spring bearing against the free end of the vibratory plate D, as clearly shown in Fig. 2, and serves to form a spring cushion for preventing the vibration of said plate. By means of the adjustable bolt H, I am enabled to regulate the tension of the spring or cushion F, by turning said screw and increasing the pressure of spring F, and consequently, increase or decrease the volume of sound.

By providing the compensation spring F adapted to bear against the plate D, I overcome the undue vibrations thereof and cause the needle to record perfectly and uniformly when the phonograph is used in heavy or loud tones, thereby allowing of the reproduction thereof with its proper intonation, instead of a blurry or discordant reproduction as has heretofore been the case. Should, however, my invention be employed in connection with phonographs having distinct and separate recording and reproducing mechanism, it becomes necessary that the compensation spring, Which forms an elastic cushion, be applied to each, inasmuch as if applied to the recording mechanism only, the indentations are formed so deep on the phonogram cylinder that undue vibration takes place in the reproducing. mechanism or diaphragm. Gonsequently, it becomes necessary that a tension spring, elastic cushion, or similar devices be required in order to produce the pure tone.

I do not Wish to be understood as confining my self to an adjustable compensation spring, as I am aware that an elastic cushion may be employed in place thereof applied to any part the'reproducer-head extends a screw-threaded of the recording or reproducing mechanism.

Having thus described my invention, what '2 I desire to claim and secure by Letters Patent is 1. The combination with a head carrying a diaphragm, and a finger secured to said diaphragm,'of a vibrating plate hinged to said head and having a central opening therein through which the finger passes, an adjustable screw-threaded bolt fitted to said head, a spring connected with the free end of said plate at one end of the spring and with the lower end of the adjustable screw-bolt at the other end of said spring, and an arm pivoted to the under side of the vibrating plate and connected at one end with the extreme lower end of the finger, substantially as shown and described.

2. The combination witha head carrying a diaphragm and a finger, of a vibratory-plate hinged to the head and having an opening through which the finger passes, a threadedbolt projected through the head, a tensionspring on the lower portion of the bolt, and a spring having one end secured to the lower end of the said bolt and arranged to bear with its other end on the vibratory-plate, substantially as and for the purpose specified.

3. The combination with a head carrying a diaphragm and a finger, ot a vibratory-plate hinged to said head and having an opening through which the finger passes, an adjustable screw-threaded bolt fitted to said head, a cushion spring surrounding the lower portion of said bolt, a spring connected with the free end of said plate at one end and with the screw-bolt at the other end, and an arm pivoted to -the under side of the hinged plate and connected at one end with the lower end of the finger, substantially as shown and described.

4. The combination with ahead carrying a diaphragm and a finger, of a vibrating-plate hinged to said head and having an opening through which the finger passes, an adjustable screw-threaded-bolt fitted to said head, a cushion spring surrounding the lower portion of said bolt, a spring connected with the free end of the plate at one end and with the lower end of the screw threaded-bolt at the other end, and an arm pivoted to the under side of the vibrating plate, said arm carrying a needle and cutter at its free end, the other end being secured to thelower end of the finger, substantially as shown and described.

In testimony whereof I affix my signature in presence of two witnesses.

LOUIS GLASS.

WVitnesses: I

LEE D. CRAIG, N. A. AOKER. 

